Ore-roasting furnace.



P ATENTED DEC. 25, 1906.

0. W. DAVIS. ORE ROASTING FURNACE.

APPLIUATION FILED 0OT.16,1B96.

2 SHEETS-SHEET 1.

rue: NuRRIs PETERS co, wnsumcron. u. c.

No. 839,734. PATENTED DEC. 25, 1906. O. W. DAVIS.

ORB RO'ASTING FURNACE.

APPLICATION FILED 00'1.15,18B6.

2 SHEETS-BHBET Z.

THE mmms PETERS co.,'w.4smuaru|v, n. c

ITED STATES PATENT @FFICE.

ORE-ROASTING FURNACE.

Specification of Letters Patent.

Patented Dec. 25, 1 906.

Application filed October 15, 1896. Serial No. 609,037.

To all whom, it may concern.-

Be it known that I, OWEN IVARREN DAVIS, a citizen of the United States of America, re siding at Middlesboro, in the county of Bell and State of Kentucky, have invented certain new and useful Improvements in Ore-Roasting Furnaces, of which the following is a specification.

My invention is an improvement in roasting-furnaces, and while designed especially for the roasting of ores I desire it to be distinctly understood that the invention may be used not only for the roasting of ores, but for the burning of lime or any species of rock or other material where it is desirable to reduce or modify the same by burning or roastmg.

I have endeavored to simplify the construction in my present invention, to reduce to a few parts, and to add to its efi iciency, while at the same time rendering its construction very economical as well as reducing the cost of its operation.

In ore-roasters as heretofore constructed they have been operated by producer-gas, and in the present case I arrange to secure my combustion in a cheaper manner, so as to render it possible to build and operate the roaster on a very cheap scale and in localities where it would not be possible or profitable to secure producer-gas.

To this end my invention includes a central combustion-chamber, an ore-space surrounding said chamber and in communication therewith by means of a series of fines, and an outer annular vertical chamber or series of vertical chambers receiving the products of combustion and discharging the same into a stack, said annular series of fines or chambers each being provided with a series of openings in communication with the ore space or chamber and constituting an exitspace.

In the accompanying drawings I have illustrated my invention, in Figure 1, by a view illustrating the roaster in section in one half of the figure and in elevation in the other half. Fig. 2 is a part-sectional view on the line A B, Fig. 1. Fig. 3 is a sectional view on the line G H of Fig. 4. Fig. 4 is a-sectional view in detail on the line E F of Fig. 1. Fig. 5 is a detail section on the line C D of Fig. 1. 6 is a sectionalview on the line K L of In the figures the roaster is shown as of cylindrical form, and in its outer wall A are arranged a series of vertical chambers or flues B, these flues being connected, preferably, at their upper end by a draft-chamber C, from which may lead one or more stacks D. Between these lines B are partitionwalls a, and these walls, as shown in Fig. 6, are built up of checker-work, leaving passages b in the walls, which thus practically connect the adj aoent flues, while at the same time the strength of the outer wall is added to by the partitions between the two.

WVithin the outer wall A and between it and an inner circular wall E is located the ore-space F, which is of tapering form gradually enlarging at the base. The ore is fed in at the top and drops by gravity through the roasting-chamber and is delivered through discharge chutes after being thoroughly roasted. WVithin the inner wall E I provide a combustion-chamber G and prefer to arrange in the lower part of this chamber and extending from the interior thereof through to the outer wall two grates which may be of ordinary construction and adapted to burn Wood, coal, or other fuel. The products of combustion generated by these grates pass into the combustiomchamber G and from thence through openings 0 in the wall E, through the ore-chamber and the ore contained therein, and through the openingsd to the flues B, and from thence to the draftchamber C and stacks D.

I do not limit myself strictly to the use of grates and fuel adapted to be burned thereon, as it may be found desirable to use such a roaster in connection with producer-gas; neither do I limit myself to the use of a draft chamber, as this may be dis ensed with, and the products of combustion 'inally pass ofi directly from one or more of the vertical fluesB.

It will be seen that the construction described is exceedingly simple, very economical to erect, and requires very little skill in operation and, further, that its production is not limited to any particular kind of material, and it is equally effective in roasting one material as another.

What I claim is- 1. In an ore roasting or calcining furnace, an annular ore-space, a central combustionchamber, an external annular exit-space, and a draft producing means communicating with said exit-space, in combination with numerous definite free passages at a plurality of different levels leading directly from the combustion-chamber to the inside of the orespace, and definite passages at a plurality of different levels leading from the ore-space to the exit-space, substantially as described.

2. In an ore roasting or calcining furnace, an annular orespace, a central combustionchamber, a grate in connection with the com bustion-chamber, and an external annular exit-space, in combination with a draft-stack connected to the exit-space, and numerous free passages at a plurality of different levels leading directly from the combustion-chamber to the inside of the ore-space, and definite passages leading from the ore-space to the exit-space, substantially as described.

3. In an ore roasting or calcining furnace an annular ore-space, a central combustion chamber communicating therewith by numerous openings at various points at different levels, and a series of vertical flues in free communication with the ore space, and means for producing a draft from the com bustion-chamber across the ore-space to and out of the vertical fiues.

4. In combination, in a roasting or calcining furnace, a central combustion-chamber, a surrounding ore-chamber, numerous definite passages from the combustion-chamber to the ore-chamber, a series of verticalflues surrounding the ore -space and connected therewith by numerous definite openings, an annular chamber in communication with said fiues for receiving the discharge therefrom, and means for creating a draft out of the said annular chamber, substantially as described.

5. An exit-space for an ore-roasting furnace comprising a series of vertical fiues, and an annular chamber in free communication therewith, substantially as described.

6. In an ore roasting or calcining furnace an annular ore-space, a central chamber, means for supplying highly-heated gases to said chamber, a plurality of definite and widely-distributed passages leading directly from the combustion-chamber to the orespace, an exit or collection space outside of, and substantially surrounding, the ore-space, a plurality of definite and widely-distributed passages leading directly from the ore-space to the collection-space, and means for withdrawing gases from the collection-space.

7. In an ore roasting or calcining furnace the combination with a central combustion chamber, of an annular ore-space, a plurality of substantially radial unobstructed passages leading from the combustion-chamber to the ore-space, a plurality of vertical flues surrounding the ore-space, and a plurality of unobstructed passages leading from the ore space to the flues, so arranged that the gases can freely pass from the combustion-chamber across the ore-space in a substantially radial path.

8. In an ore roasting or calcining furnace the combination with a central combustionchamber, of an annular ore-space and a plurality of substantially radial open passages leading from the combustion-chamber to the orespace, a plurality of vertical fiues surrounding the ore-space, a plurality of open passages leading from the ore-space to the fiues, so arranged that the gases can pass from the combustion-chamber across the orespace in a substantially radial path, a continuous annular space above said fines, and means for withdrawing gases from said space.

9'. In an ore roasting or calcining furnace the combination with a central combustionchamber, of an annular ore-space and a plurality of substantially radial passages leading from the combustion-chamber to the orespace, a plurality of vertical flues surrounding the orespace, a plurality of passages leading from the ore-space to the flues, so arranged that the gases can pass in the combustion-chamber across the ore-space in a substantially radial path, a continuous annular collectionspace above said fines, and a plurality of gasstacks communicating with said space.

10. In an ore roasting or calcining furnace an annular ore-space, a central combustionchamber extending through substantially the height of said ore-space, an external collection or draft chamber extending substantially through the active height of the orespace, a number of normally open and definite passages connecting said combustion-chamber with said ore-space, a number of similar passages connecting said ore-space with said draft-chamber and means for creating a draft.

1 1. In an ore roasting or calcining furnace, a circular wall closed at the top and inclosing a combustion-chamber, openings in said wall, one or more grates communicating with said combustion-chamber, and two additional circular walls outside of the first-mentioned wall, with a number of definite openings allowing gases to pass from the grate to the combustion-chamber, thence through the ore-space, in a substantially radial path, and thence to a collection or draft chamber inclosed between the two outer walls.

12. In an ore roaster or calcining furnace, a circular wall inclosing a combustion-chamber, means for introducing fuel into said chamber, and two additional circular walls outside of the first-mentioned circular wall and forming respectively an ore-chamber and a collection-chamber, said walls being formed of high resisting material at points where they come in contact with gases of high temperature, with a number of definite openings distributed in said walls in such a manner as to allow gas from the combustion- I 0 IOO chamber to pass'freely across the ore-space I In testimony whereof I aflix my signature to the collection-chamber, with means for re- 1 in presence of two witnesses. moving the products of combustion from the OWEN WARREN D AVIS collection-chamber, said openings being so 5 formed as to allow the fine ores to slip freely Witnesses:

from the openings whereby the openings are GEO. ECKI-IARD, prevented from being clogged by the ore. R. B. DUYOKINCK. 

